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helo=balrog.mythic-beasts.com; client-ip=46.235.227.24 Received: from balrog.mythic-beasts.com (balrog.mythic-beasts.com [46.235.227.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx1.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Tue, 17 Dec 2019 16:31:53 -0500 (EST) (envelope-from miller@hamnavoe.com) Received: from [88.97.27.83] (port=38564 helo=zen.hamnavoe.com) by balrog.mythic-beasts.com with esmtpsa (TLS1.0:RSA_3DES_EDE_CBC_SHA1:192) (Exim 4.92.3) (envelope-from ) id 1ihKRY-0007H1-Dw for 9fans@9fans.net; Tue, 17 Dec 2019 21:31:52 +0000 Message-ID: To: 9fans@9fans.net Subject: Re: [9fans] Forcing display size on Pi4 From: Richard Miller <9fans@hamnavoe.com> Date: Tue, 17 Dec 2019 21:31:47 +0000 In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-BlackCat-Spam-Score: 1 X-Spam-Status: No, score=0.2 Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: a78b1c12-2114-11ea-a4af-98cc288a8b4c > I have a 2K display that Plan9 forces to 1920x1080 resolution. > Poking around 9/bcm/screen.c indicates that setting vgasize=WxHxD > should force the size, but adding a suitable entry in cmdline.txt > just gives me a blank display. > > Before I dig deeper, is this expected to work? Possibly not. I haven't tried vgasize= for years and there have been a lot of changes to the firmware & videocore mailbox interface since then. Plan 9 should accept whatever resolution comes from the gpu, so it may be the firmware which "forces" 1920x1080. Maybe gpu_mem needs to be bigger than the usual 16, or some other config.txt adjustment is needed?